DWM 1001-dev mode selection

[mciholas]

@nudel

1. I saw that decawave is only certified in 6.5 GHZ in FCC but MDEK-1000 allows to change the channel. So, why they didn´t certify in the frequency of 4GHz ?

You will have to ask Decawave as I don’t speak for them.

I will note that the FCC rules for UWB get more complex for the lower bands. 15.517 requires use only “indoors” and 15.519 requires use only for “hand held” devices, and perhaps neither of which can be assured for the DWM1001 on which the MDEK is based.

2) My regulatory is Anatel, from Brazil, and according to its rules it follows exactly the same regulations from FCC. I believe I can certify to use in 4GHz and develop a new antenna, but I´d like to know if in this lower frequency , the EIRP should be -51dbm/MHz instead or could be -41.3 dbm/MHz. It was not very clear to me according to FCC

If certifying under 15.250, the rule the DWM1001 is certified under presently, and you go to a lower band, you have to be under -51.3 dBm/Mhz EIRP. This is a 10 dB penalty in power which will reduce your range to about 30-50% of what it was before. This assumes the antenna on a DWM1001 actually works well at lower bands, which I don’t think it does. I don’t think Decawave tested it for the lower bands under 15.250 in any case, so there’s no regulatory basis for doing that.

If you certify under 15.517 or 15.519, then you can use -41.3 dBm/MHz EIRP. But you have to abide by the use limitations (indoors, or handheld). I don’t think Decawave certified the DWM1001 under 15.517 or 15.519. That could happen in the future, though.

I am not directly familiar with the Brazil rules for UWB.

3) The FCC alerts that the equipment should not be used in outdoor applications if you don´t use any infrastructure. Am I correct ? If I want to have several anchors in an outdoor environment, is there another way to use it and being in compliance with regulator?

This is a complex subject I have written about previously:

FCC regulation on UWB

You will not find a clear and authoritative interpretation from the FCC on what is “fixed outdoor infrastructure” as stated in 47 CFR 15.250(c). All three words are subject to interpretation. Let’s handle “infrastructure” first. When the FCC put the 15.250 rules in place in the 1990s, there were hearings and discussion on the proposed rules which were aimed at making sure UWB did not proliferate in a way to damage the incumbent spectrum holders, the so called “anti proliferation rules”. Bas…

Unlike most radio rules, UWB has use case limitations. Anchors mounted outdoors which transmit are in a gray area. Any truly usable UWB system has one or more fixed transmitters somewhere.

Mike Ciholas, President, Ciholas, Inc
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